???????????1??4?? ??,????????«?????????????????????????»,???,??(???????????)???????????????????????????????????,?????????

?????????,??????????????????????????????,?????,???????,?????????,?,????

????????:???? ??“??????”????

?? ??????????????????????

????:1???????:????

2?????vx

3?????????

4????????

5?????300?3??????

???????????1??4?? ??,????????«?????????????????????????»,???,??(???????????)???????????????????????????????????,?????????

?????????,??????????????????????????????,?????,???????,?????????,?,????

????????:????